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Scattered transmission

The total transmission degree constitutes both the directed and the scattered proportions. The scattered proportion is referred to as haze in some applications and defines the corresponding diffusion effect of a radiation beam penetrating a material. Causes for the diffusion hereby include surface disturbance, embedment and the structural pattern of a material.


Measurement of scattered transmission

The scattered proportion of the transmission can be measurement using a collimated light source and an integrating sphere. The sample is directly illuminated with the light beam as per the 0/D measurement set described by DIN 5036 and CIE130. The integrating sphere is placed with the light exit port aligned to the sample. The directed proportion of the transmission exits the integrating sphere through a port aligned at an angle of 180° to the measurement port. The diffuse transmittance is captured by the sphere. An illustration of a measurement setup for haze measurements in thin foils is found in the ASTN D 1003.


Haze measurements

The LCRT-2005-S has a D/0 measurement setup that corresponds to the Helmholtz reciprocity principle for reversibility of the radiation beam and that offers an alternative to the 0/D measurement geometry. The scattered proportion of the transmission can not be measured directly when using the LCRT-2005-S. This applies the principle where the entire transmittance is measured for diffuse illumination of thin samples whereas direct transmittance is measured for parallel illumination. The difference of these two values gives the diffuse proportion of the transmittance. Switching from diffuse to directed illumination is done by respectively setting the distance between the sample and the light source. The B2S-75-TRTH rail bench has an moveable sample holder that can be used to vary the distance between the light source and the sample.


LCRT-2005-S light transmission measurement device

The LCRT-2005-S is elaborately designed for light transmission measurement of thin, diffusing and non-diffusing samples. The D/O measurement geometry comprises of an integrating sphere light source and a luminance measurement device. The monitor detector of the light source and that of the receiver are equipped with a diode array. The spectral measurement data enables precise simulation of the standard light spectra of the source and the photometric responsivity spectrum of the receiver. The sample is aligned in front of the light source for measurement. The transmittance can thus be determined through diffuse sample illumination also for thin scattering samples.


Spectral photometer LCRT-2005-S

The LCRT-2005-S can also be used as a spectrophotometer due to its spectral measurement detectors in source and receiver. The spectral range is between 425 nm to 705 nm.


Stationary and hand-held measurement device

The LCRT-2005-S can be used either with or without the B2S-75-TRTH optical bench and is hence suitable for a wide range of applications.


USB interface with readout software

The USB interface enables data readout and power supply. The software delivered with the device can be used for measurement data readout.

Transparent sheets with structure patterns
Scattered transmittance (Haze) of a scratched sample and clear sample as a function of the distance between the light source and sample.
B2S-40-TRTH rail bench for the LCRT-2005-S
D/0 Messanordnung bei kurzem Abstand zwischen Probe und Lichtquelle
0/0 Messanordnung bei langem Abstand zwischen Probe und Lichtquelle
General
LCRT-2005-S

see LCRT-2005-S data sheet

Product
Bench

Aluminum profile, 1m long, two steel guide rails at a 75 mm distance

Source holder

Height adjustable support made of black anodized aluminum with holder for the LCRT-2005-S source

Receiver holder

Height adjustable support made of black anodized aluminum with holder for the LCRT-2005-S receiver

Sample holder

Slide & Fix sample holder with 30 mm free port. Manual setup of the distance between the source and sample. Millimeter tape measure. Adjustable stopper.

Type Description File-Type Download
Datasheet B2S-40-TRTH PDF
Produktname Product Image Description Show product
LCRT-2005-S Light-transmission hand-held meter for thin and flat samples.

Features: Fast and precise because of spectral monitor and luminance detector. Automatic ambient light compensation. Alignment camera. ECE R43 compliant. Simulated A, C and D65.
LCRT-2005-S+850 Light and 850nm transmission hand-held meter for thin and flat samples.

Features: Fast and precise because of spectral monitor and luminance detector. Automatic ambient light compensation. Alignment camera. ECE R43 compliant. A, C, D65 and 850nm light.
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Product
15298640 B2S-40-TRTH

Complete rail bench